Note 5 - Stock-based Compensation - Fair Value Assumptions (Details) - $ / shares	12 Months Ended
	Feb. 27, 2022	Feb. 28, 2021	Mar. 01, 2020
Weighted average fair value per share of option grants (in dollars per share)	$ 2.76	$ 2.12	$ 3.97
Expected dividend yields			2.43%
Minimum [Member]
Risk-free interest rates	0.74%	0.23%	2.24%
Expected stock price volatility	27.80%	26.90%	30.40%
Expected dividend yields	2.73%	3.18%
Estimated option terms (in years) (Year)	4 years 4 months 24 days	4 years 3 months 18 days	4 years 3 months 18 days
Maximum [Member]
Risk-free interest rates	1.85%	0.42%	2.26%
Expected stock price volatility	29.20%	30.00%	31.50%
Expected dividend yields	3.07%	3.49%
Estimated option terms (in years) (Year)	7 years 7 months 6 days	7 years 7 months 6 days	5 years 9 months 18 days